Active circuit for RFID
First Claim
Patent Images
1. A memory card comprising:
- a smartcard controller coupled to receive power from a host device;
an amplifier to receive a signal from a receive antenna when the receive antenna is inductively coupled to another device, the amplifier providing a simplex communication path from the receive antenna to a contactless interface on the smartcard controller; and
a transmit circuit to receive outgoing data from the contactless interface and to drive a transmit antenna.
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Accused Products
Abstract
An RFID card includes a smartcard controller that receives power from a host device. The RFID card also includes a small inductive device capable of inductive coupling with an RFID reader. The small inductive device is small enough to fit in the form factor of a memory card or SIM card. Enhancement circuits enhance the usable read and write distance of the RFID card.
272 Citations
17 Claims
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1. A memory card comprising:
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a smartcard controller coupled to receive power from a host device; an amplifier to receive a signal from a receive antenna when the receive antenna is inductively coupled to another device, the amplifier providing a simplex communication path from the receive antenna to a contactless interface on the smartcard controller; and a transmit circuit to receive outgoing data from the contactless interface and to drive a transmit antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A subscriber identity module (SIM) card comprising:
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a smartcard controller coupled to receive power from a host device; an amplifier to receive a signal from a receive antenna when the receive antenna is inductively coupled to another device, the amplifier providing a simplex communication path from the receive antenna to a contactless interface on the smartcard controller; and a transmit circuit to receive outgoing data from the contactless interface and to drive a transmit antenna. - View Dependent Claims (9, 10, 11, 12, 13)
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14. An apparatus comprising:
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a smartcard controller having a contactless interface that includes two pads intended for connection to a coil, wherein the smartcard controller includes load modulation circuitry coupled to one of the two pads for half duplex communication when the coil is inductively coupled to a coil of a separate device; a receive coil; an amplifier coupled to receive a signal from the receive coil when the receive coil is inductively coupled, and to drive one of the two pads; a transmit coil; and a circuit coupled to one of the two pads to detect effects of the load modulation circuitry, and to drive a signal on to the transmit coil. - View Dependent Claims (15, 16, 17)
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Specification